Phoenix is 10 hours behind Athens

There is no standard 8-to-6 overlap. Someone joins early or late.

With 10 hours between them, Athens and Phoenix have no overlap during standard business hours — by the time one team logs on, the other has logged off. The usual fix is an early start for Phoenix or a late finish for Athens — pick whichever team has more flexibility. Note the seasonal wrinkle: when Athens is on daylight saving and Phoenix isn't, the gap between them grows or shrinks by an hour.